Evacuated glass panel having degassing device

ABSTRACT

An evacuated glass panel having degassing device, which includes at least tow planar glass sheets having any shape and support means posed therebetween, edge frame component sealed around periphery of the planar glass sheet, and degassing device disposed in the evacuated space of evacuated glass panel; between said degassing device and said groove a low melting point glass powder layer is placed and said low melting point glass powder layer is fixed in said groove.

TECHNICAL FIELD

The present invention relates to an evacuated glass panel havingdegassing device, particularly, an evacuated glass panel havingdegassing device disposed in evacuated chamber of thinner evacuatedglass panel, the present invention concerns the technical field of glassmanufacturing.

BACKGROUND OF THE ART

The evacuated glass panel is a high thermo and sound insulating glasspanel made by evacuation of the space between planar glass sheets,periphery of which is sealed.

The evacuated glass penal is forge rapidly ahead through nearly ahundred years investigation and development. Both the theoretical studyand proved that evacuated glass panel is an ideal thermo and soundinsulating material and it can be used in door and window of buildingand thermo-insulating cabinet, refrigerator or freezing cabinet in orderto a chive higher thermo and sound insulating effect, must providehigher degree of evacuation.

In order to increase the degree of evacuation people commonly employsdegassing device disposed in space between planar glass sheets.

The degassing device is made from powder-particle of alloy containingzirconium (Zr) and aluminum (Al) as main composition (84% Zr and 16%Al), pressed on a metal base.

After disposing the degassing device in space between planar glasssheets of evacuated glass panel, employing the vaporization activated byhigh frequency, to form a fresh interface, which has a strong adsorptionfor the residual gas left in evacuated space, there by increasing thedegree of evacuation and resisting to radiation of the evacuated glasspanel.

However, during manufacturing evacuated glass panel manufacturingevacuated glass panel having smaller thickness, the disposing degassingdevice between planar glass sheets became very difficult.

Because the space between planar glass sheets is very small, and thesize of degassing device is always larger than the space between planarglass sheets of evacuated glass panel, such the degassing device can notbe placed in.

At present, the method for placement of degassing device in thinnerevacuated glass panel is to form a groove on the surface of planar glasssheet of evacuated glass panel for placing degassing device.

The evacuated glass panel made by this method has greatly reducedmechanical strength, this is because that at the time of groove forming,around groove the stress is excessively concentrated, at same timearound groove micro crack is easily occurred, and when the degassingdevice is heated to high temperature, the micro crack may furtherspread. The micro crack and concentration of stress may lead to fractureof the evacuated glass panel during manufacture process or practical usetherefore, the concentration of stress and occurrence of micro crackgreatly decrease the mechanical strength of evacuated glass panel.

In addition, because the air discharge hole of traditional evacuatedglass panel is sealed by a small pump-out tube through solder glass (alow melting point glass powder) and soldered in air discharge hole,during sealing air discharge hole, the end of pump-out tube is heated tomelt and join tube. Because the hole sealing place is protruded fromplanar glass sheet, a further technologic treatment is necessary, if amechanic cap or sealing layer protect is added, the structure of sealingair discharge hole is rather complex, many operations is necessary; insome case the solder glass and sealing piece is used to sealing airdischarge hole, however, in order to insure absence of air leak in airdischarge hole, the solder glass and sealing piece is protruded fromplanar glass sheet after it is melted. Due to the sealing place of airdischarge hole is uneven after its sealing, said sealing place is easyto be damaged and resulted in air leak during assembling andtransporting evacuated glass panel, there by losing the thermo andsound-insulating effect of evacuated glass panel.

SUMMARY OF THE INVENTION

The main object of the present invention is, regarding to the aboveproblem of disposing degassing device during production process ofevacuated glass panel, to provide an evacuated glass panel havingdegassing device, this evacuated glass panel having degassing device canresolve the problem of difficulty in disposing degassing device on onehand, particularly within evacuated glass panel having smallerthickness, and also effectively avoid or greatly reduce the inner stressand micro crack at place of degassing device on the other hand, there byincreasing the mechanic strength of evacuated glass panel, making it noteasy to break in use and increasing the ratio of qualitative evacuatedglass panel during production.

A further object of the present invention is, regarding to aboveshortage in operation complexity and easy air leak, to provide anevacuated glass panel having degassing device, said evacuated glasspanel has an even sealing surface of the air discharge hole, effectivelyovercoming the problem of traditional protruded sealing surface easy tobe damaged and resulted in air leak.

Above objects of this invention are realized through following technicalschemes:

An evacuated glass panel having degassing device, which includes atleast two planar glass sheets having any shape and support meansdisposed therebetween, edge frame component sealed around the peripheryof the planar glass sheet, and degassing device disposed in theevacuated space of evacuated glass panel, said degassing device isplaced in the groove opened on inner surface of planar glass sheet;between said degassing device and said groove a low melting point glasspowder layer is placed, and said degassing device through said lowmelting point glass powder layer is fixed and joined in said groove.

Said groove is opened on the inner surface at the same position of twoplanar glass sheets; in said groove said low melting point glass powderlayer is applied.

Said degassing device simultaneously inserted into the groove on theinner surface at the same position of two planar glass sheets, andthrough said low melting point glass powder layer fixed and joined withsaid groove.

Said planar glass sheet has a sealing piece inserted on its outersurface for sealing the air discharge hole; around the periphery of saidair discharge hole at outer surface of planar glass sheet a concaveportion is opened for inserting the sealing piece; Said sealing piecethrough the low melting point glass powder layer is used to melt andjoin with concave portion and close said air discharge hole.

Said sealing piece has a thickness corresponding to the total thicknessof low melting point glass powder layer and equal to the deep ness ofsaid concave portion.

Said groove is opened on inner surface of another planar glass sheet atthe same position respecting to air discharge hole, making the anotherend of degassing device fixed in groove is inserted into inner end ofsaid aid discharge hole.

Said low melting glass powder layer is formed through sintering loemelting point powder.

In the technical schemes of this invention, the low melting point glasspowder is applied in groove, in which degassing device fixed, aftersintering it becomes a low melting point glass powder layer. This schemecan insure under the premise of further increasing degree of evacuation,to eliminate the effluence of stress concentration and micro crack onthe strength of evacuated glass panel by of low melting point glasspowder layer.

Because the degassing device is sintered to groove of planar glass, thelow melting point glass powder has thermal conductivity far lower thanthat of glass, the instantaneous heating degassing device not exert avery large influence, there by decreasing the energy consumption andincreasing operation effect, and the ratio of qualitatively finishedproduct is greatly improved.

This is not only one, in the technical scheme of present inventionbecause the groove is simultaneously opened on inner surface of top andbottom planar glass sheets, particularly the air discharge hole can beused for placing degassing device, this makes the deepness of grooverather shallow, the mechanic strength of evacuated glass panel speciallyevacuated glass panel specially evacuated glass panel speciallyevacuated glass panel of thin type greatly increased.

Moreover, due to the employing even sealing piece for sealing airdischarge hole, the danger of air leak in assembly and use is reduced.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic cross sectional view of an embodiment according tothis invention;

FIG. 2 is a schematic cross sectional view of another embodimentaccording to this invention.

BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be described in more detail by way ofembodiment with reference to accompany drawings as follows.

EXAMPLE 1

As shown in FIG. 1, on the inner surface of top planar glass sheet 1 andbottom planar glass sheet 2 two grooves 3 are simultaneously opened, ingroove 3 the degassing device 3 is placed, there by increasing thedegree of evacuation and radiation resistance. The tow simultaneouslyopened grooves avoid the difficulty due to small space of evacuatedchamber. The low melting point glass powder is firstly applied betweengroove 3 and degassing device, then the degassing device is placed,after sintering the low melting point glass powder is solidified forminga low melting point glass powder layer 5. The formed low melting pointglass powder layer 5 fixed the degassing device 4 in groove 3.

After the operation of evacuation of evacuated glass panel vaporizationactivated by high frequency is performed in order to absorb residual gasand increase degree of evacuation, making this embodiment have thermoand sound insulating effect.

Moreover, because the low melting point glass powder has thermalconductivity far lower than that of glass, the instaneous heatingdegassing device cannot break up the glass, thereby increasing the ratioof qualitatively finished product.

EXAMPLE 2

As shown in FIG. 2, on the surface of top planar glass sheet, a airdischarge hole 12 for evacuation is opened, around the periphery of saidair discharge hole 12 the outer surface of glass sheet a concave portion122 is opened, said concave portion 122 can receive a sealing piece 6;said sealing piece 6 through the low melting point glass powder layer 5is fixed in said concave portion 122, and close said air discharge hole12 after evacuation of evacuated glass panel.

Said sealing piece has a thickness corresponding to the total thicknessof the low melting point glass powder layer 5, and equal to the deepnessof the concave portion 122, there by making the place of sealing airdischarge hole 12 sufficiently even, thus the problem of air leak can beavoid.

On the inner surface of bottom glass sheet 2 a groove 3 is opened forplacing the degassing device 4, position of said groove 3 is the same asthat of said air discharge hole 12 on glass sheet 1.

During placing the degassing device 4 with help of the air dischargehole 12 the upper end of degassing device 3 can insert into said airdischarge hole 12, this allows make the deepness of groove 3 rathershallow, the mechanical strength of evacuated glass panel increased,thus suitable for production of evacuated glass panel having smallthickness.

At last, it should be noted, that above-mentioned embodiments areemployed only for description of the technical schemes of the presentinvention and should not be limited thereon, although the presentinvention bas been detailedly described, it should be apparent to thoseof ordinary skilled in the art that modifications and variations may bemade without departing from the spirit and scope of the technicalschemes of the present invention, all they should be included within thescope of appended claims.

1. An evacuated glass panel having degassing device, which includes atleast two planar glass sheets having any shape and support meansdisposed therebetween, edge frame component sealed around the peripheryof the planar glass sheet, and degassing device disposed in theevacuated space of evacuated glass panel, characterized in that saiddegassing device is placed in the groove opened on inner surface ofplanar glass sheet; between said degassing device and said groove a lowmelting point glass powder layer is placed, and said degassing devicethrough said low melting point glass powder layer is fixed and joined insaid groove.
 2. The evacuated glass panel having degassing deviceaccording to claim 1, wherein said groove is opened on inner surface atthe same position of two planar glass sheets; in said groove said lowmelting point glass powder layer is applied.
 3. The evacuated glasspanel having degassing device according to claim 2, wherein saiddegassing device simultaneously inserted in to the groove on the innersurface at the same position of two planar glass sheets, and throughsaid low melting glass powder layer faxed and joined with said groove.4. The evacuated glass panel having device according to claim 3, whereinsaid groove is a square, circular or cone-shape groove.
 5. The evacuatedglass panel having degassing device according to claim 1, wherein onouter surface of planar glass sheet a sealing piece for sealing airdischarge hole is inserted; around the periphery of said air dischargehole at surface of glass sheet a concave portion is opened for receivingthe sealing piece in concave portion; said sealing piece through the lowmelting point glass powder layer is melted and joined with said concaveportion, and close said air discharge hole.
 6. The evacuated glass panelhaving degassing device according to claim 5, wherein said sealing piecehas a thickness corresponding to the total thick ness of low meltingpoint glass powder layer, and equal to the deepness of said concaveportion.
 7. The evacuated glass panel having degassing device accordingto claim 2 or, 5, wherein said groove is disposed on the inner surfaceof another planar glass sheet at the said position as that of airdischarge hole, making the another end of degassing device insert intoinner end portion of said air discharge hole.
 8. The evacuated glasspanel having degassing device according to claim 1, 2, 5 or 6, whereinsaid low melting glass powder layer is formed through sintering the lowmelting point glass powder.